<div class="ul-section">
    <div class="ul-loading-pos">
        <div class="main">加载中</div>
    </div>
</div>

<div class="ul-section">
    <div class="ul-loading-pos lg">
        <div class="main">加载中</div>
    </div>
</div>
<div class="ul-section">
    <div class="ul-loading-pos screen">
        <div class="main">加载中</div>
    </div>
</div>